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Waldron, James S; Sughrue, Michael E; Hetts, Steven W; Wilson, Sean P; Mills, Steven A; McDermott, Michael W; Dowd, Christopher F; Parsa, Andrew T . (2011). Embolization of Skull Base Meningiomas and Feeding Vessels Arising From the Internal Carotid Circulation. Neurosurgery, 68(1), 162–169. doi:10.1227/neu.0b013e3181fe2de9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research